SENSORS AND ACTUATORS B-CHEMICAL
·
2018
·
IF 5.667
Yangxia Han,Yonglei Chen,Juanjuan Liu,Xiaoying Niu,Yunxia Ma,Sudai Ma,Xingguo Chen
Silicon nanoparticles (SiNPs) have attracted increasing attentions due to their unique properties and related applications. However, previously reported SiNPs generally showed emission band only in the blue- or green-light regions, which limited their applications in biochemical samples. So far, synthesis of longer wavelength emissive SiNPs remains a challenge. In this paper, the yellow-emitting fluorescent SiNPs were prepared via a facile room temperature procedure, which avoided heating and pressurizing operation, multistep and time-consuming post-modified procedures. The obtained SiNPs displayed excellent water-solubility, pH-stability, salt-tolerance, and photo-stability. Significantly, the fluorescence of SiNPs could be remarkably quenched by crystal violet (CV) via synergistic effect of inner filter effect (IFE) and fluorescence resonance energy transfer (FRET). Based on this phenomenon, a method for the determination of CV was established. Under the optimum conditions, the method showed a wide linearity range from 0.075 to 15.0 μg/mL with a limit of detection of 25 ng/mL. Furthermore, the method was successfully applied to the analysis of CV in fish tissues samples.
研究领域:
生物化学
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分析化学
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2020
·
IF 5.162
Ahmed M. Omer,Gehad S. Elgarhy,Gehan M. El-Subruiti,Randa E. Khalifa,Abdelazeem S. Eltaweil
Novel anionic adsorbent microbeads were fabricated based on surface functionalization of p -benzoquinone-carboxymethyl cellulose (CMC-PBQ) activated microbeads with iminodiacetic acid (IDA). The developed IDA@CMC-PBQ microbeads were characterized by FT-IR, TGA, SEM, XPS and zeta potential analysis tools. Ion exchange capacity measurements proved the successful generation of extra carboxylic groups on the surface of IDA@CMC-PBQ microbeads with a maximum value reached 3.984 m eq /g compared to 1.32 m eq /g for neat CMC microbeads. The fabricated microbeads were tested for the removal of cationic crystal violet (CV) dye from aqueous solutions under various adsorption conditions. The results clarified that the removal percent of CV dye was augmented and reached a maximum value of 91.56% with increasing IDA concentration up to 0.15 M. Moreover, the experimental data were well-fitted both Langmuir and Freundlich isotherms with a maximum adsorption capacity of 107.52 mg/g. while the adsorption process was obeyed the pseudo-second order kinetic model. The developed adsorbent displayed respectable reusability after five sequential cycles and exhibited higher adsorption ability towards cationic CV dye compared to cationic methylene blue (MB) and anionic methyl orange (MO) dyes. Therefore, IDA@CMC-PBQ adsorbent could be effectually used as a convenient and reusable adsorbent for removing cationic dyes from their aqueous solutions.
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
MICROCHIMICA ACTA
·
2024
·Vol. 191
·期 4
·1-12
·
IF 5.3
Ruan Shuyan,Wang Wenxi,Qiu Liting,Yan Xin,Peng Zhihua,Zhu Huina,Liu Yunzhen,Lu Yudong,You Ruiyun
A simple and cost-effective fabrication method of gold nanorods (AuNRs) nanoparticles hybridized with polyvinyl alcohol hydrogel (AuNR/PVA) for SERS substrate is described. The AuNR/PVA achieves the control of inter-particle nanogap by modulating the density of gold nanorods, and inter-particle nanogap by the spatial deformation of the hydrogel, and the reduction of the gap between the AuNRs deposited on hydrogel makes the SERS enhancement. In addition, the AuNR/PVA substrate maintains high SERS activity after more than 100 cycles of bending and storage in air for 30 days, and the substrate possesses high sensitivity and high reproducibility. Combining a flexible and transparent surface-enhanced Raman spectroscopy (SERS) substrate for in situ detection with a small portable Raman can be applied to scenarios such as environmental detection and hazardous materials detection. The substrate showed excellent SERS activity against malachite green (MG) and crystal violet (CV) with limits of detection of 1.18 × 10 −13 M and 7.17 × 10 −12 M, respectively. The usability of the proposed SERS substrate was demonstrated by detecting the above contaminants in aquatic water. This work not only utilizes a cost-effective method for mass production but also provides a reliable and convenient platform for the preparation of other noble metal flexible substrates. Graphical
研究领域:
纳米技术
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分析化学
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材料科学
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光谱学
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环境监测
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DOI
高影响因子
Scientific Reports
·
2022
·Vol. 12
·期 1
·1-16
·
IF 4.996
Gomaa Hassanien,Abd El-Monaem Eman M.,Eltaweil Abdelazeem S.,Omer Ahmed M.
The jeopardy of the synthetic dyes effluents on human health and the environment has swiftly aggravated, threatening human survival. Hence, sustained studies have figured out the most acceptable way to eliminate this poisonous contaminant. Thereby, our investigation aimed to fabricate montmorillonite/magnetic NiFe 2 O 4 @amine-functionalized chitosan (MMT-mAmCs) composite as a promising green adsorbent to remove the cationic methylene blue (MB) and crystal violet (CV) dyes from the wastewater in neutral conditions. Interestingly, MMT-mAmCs composite carries high negative charges at a wide pH range from 4 to 11 as clarified from zeta potential measurements, asserting its suitability to adsorb the cationic contaminants. In addition, the experimental study confirmed that the optimum pH to adsorb both MB and CV was pH 7, inferring the ability of MMT-mAmCs to adsorb both cationic dyes in simple process conditions. Furthermore, the ferromagnetic behavior of the MMT-mAmCs composite is additional merit to our adsorbent that provides facile, fast, and flawless separation. Notably, the as-fabricated composite revealed an auspicious adsorbability towards the adsorptive removal of MB and CV, since the maximum adsorption capacity of MB and CV were 137 and 118 mg/g, respectively. Moreover, the isotherm and kinetic investigatins depicted that the adsorption of both cationic dyes fitted Langmuir and Pseudo 2nd order models, respectively. Besides, the advanced adsorbent preserved satisfactory adsorption characteristics with maximal removal efficacy exceeding 87% after reuse for ten consecutive cycles. More importantly, MMT-mAmCs efficiently adsorbed MB and CV from real agricultural water, Nile river water and wastewater samples at the neutral pH medium, reflecting its potentiality to be a superb reusable candidate for adsorptive removal cationic pollutants from their aquatic media.
研究领域:
环境科学
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材料科学
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化学工程
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水处理
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产品关联
DOI
PubMed
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2018
·Vol. 20
·期 28
·19208-19220
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IF 3.906
Yan Xiong,Jie Chen,Ming Duan,Shenwen Fang
The interfacial adsorption and interaction of crystal violet (CV) at the silica–water interface was real-time measured based on a total-internal-reflection-induced near-field evanescent wave (TIR-NFEW). A silica optical fiber (SOF) was employed as a charged substrate for CV adsorption and as a light transmission waveguide for evanescent wave production for the investigation system. According to the change of evanescent wave intensity, the CV adsorption behavior could be real-time monitored at the silica–aqueous interface. The Langmuir adsorption model and two kinetic models were applied to obtain the related thermodynamic and kinetic data, including the adsorption equilibrium constant (Kads) of (5.9 ± 1.5) × 104 M−1 and adsorption free energy (ΔG) of −21.6 ± 0.6 kJ mol−1. Meanwhile, this method was shown to be able to isolate the elementary processes of adsorption and desorption under steady-state conditions, and gave an adsorption rate constant (ka) and desorption rate constant (kd) of 2089 ± 6.96 M min−1 and 0.35 ± 0.0012 min−1 for a 15 rpm flow rate. The surface interaction process was revealed and the adsorption mechanism proposed by a molecular orientation adsorption model with three-stage-concentration, indicating that CV first adsorbed on Si–O− sites through electrostatic attraction, then on Si–OH sites through hydrogen bonding, and lastly on the surface through van der Waals forces with different CV concentrations. This study can provide a molecular-level interpretation of CV adsorption and provides important insights into how CV adsorption can be controlled at the silica–water interface.
研究领域:
分析化学
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表面科学
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环境科学
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DOI
PubMed
高影响因子
FOOD CHEMISTRY
·
2025
·
IF 9.8
Yupeng Sun,Kaihui Zhou,Yuxin Wang,Ye Lin,Weiran Wang,Xue Xiong,Xiangru Zhao,Huinan Cui,Min Liang,Qiao Wang,Shengnan Yang,Li Li
Rapid, low-cost, and in-situ detection of illegal residues on aquatic product surfaces remains a significant challenge. Herein, we developed a versatile surface-enhanced Raman scattering (SERS) sensor by integrating instant interfacial self-assembled silver nanostar film onto flexible polytetrafluoroethylene filter membrane (AgNS/PTFE) for sensitive detection of malachite green (MG) and crystal violet (CV) in crayfish. The entire process, from room-temperature substrate preparation to detection completion, takes less than 20 min. The AgNS/PTFE flexible substrate not only provides excellent hydrophobicity for signal enhancement with minimal sample volumes (2 μL) but also ensures good uniformity, resulting in a homogeneous and dense distribution of SERS-active hot spots with superior anti-interference properties and mechanical durability. By simple “drop/wipe” operations and data visualization treatment, this method achieved detection limits as low as 10 pg/mL for MG and 7 pg/mL for CV, with in-situ analysis in spiked and actual crayfish samples, demonstrating significant potential for food safety applications.
研究领域:
食品安全
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分析化学
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材料科学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF SEPARATION SCIENCE
·
2012
·Vol. 36
·期 5
·980-985
·
IF 2.733
Ziru Lian,Jiangtao Wang
A highly selective sample cleanup procedure combined with molecularly imprinted SPE was developed for the isolation of crystal violet from seawater and seafood samples. The molecularly imprinted polymer was prepared using crystal violet as the template molecule, methacrylic acid as the functional monomer, and ethylene glycol dimethacrylate as the cross-linker. The crystal violet-imprinted polymer was used as the selective sorbent for the SPE of crystal violet. An off-line molecularly imprinted SPE method followed by HPLC with diode-array detection for the analysis of crystal violet was also established. Good linearity on the molecularly imprinted SPE columns was obtained from 0 to 200 μg/L ( R 2 > 0.99). The result demonstrated that the proposed method can be used for the direct determination of crystal violet in seawater and seafood samples. Finally, five samples were analyzed and the following crystal violet concentrations were obtained: 0.92 and 0.52 μg/L in two seawater samples, as well as 0.36 and 0.27 μg/kg in two seafood samples. There is no crystal violet detected in the third seawater sample.
研究领域:
分析化学
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环境科学
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食品科学
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DOI
高影响因子
JOURNAL OF RAMAN SPECTROSCOPY
·
2019
·Vol. 50
·期 8
·1074-1084
·
IF 2.809
Shuang Lin,Xiang Lin,Xueying Song,Siqingaowa Han,Li Wang,Wuliji Hasi
Surface-enhanced Raman scattering (SERS) substrate is the key to SERS technology and it is still a basic focus to fabricate desirable SERS substrates offering multiple advantages of strong Raman enhancement and good reproducibility and portability. A flexible paper-based SERS substrate were fabricated involving the use of Au nanocubes (NCs) monolayer. Au NCs were generated with tunable size in the range of 24 to 63 nm through seed-mediated growth method. The effect of support on SERS properties of Au NCs–assembled monolayer was systemically explored. As a result, more excellent SERS performance could be obtained by assembling Au NCs on the filter paper. Besides, the influence of Au NCs' size on SERS-enhanced effect of paper-based substrate was also investigated. Our results clearly indicated that paper-based substrate with 39 nm Au NCs possessed the optimal SERS enhancement. This SERS substrate exhibited high sensitivity with enhancement factor (EF) up to 9.75 × 10 7 and demonstrated good uniformity and time stability. Furthermore, based on this superior paper-based SERS substrate with advantage of powerful sample extraction performance, the measurement of crystal violet (CV) on shell surface were successfully carried out with detection limit down to 2.17 × 10 −7 M. And linear quantification were achieved in the range from 5 × 10 −5 to 5 × 10 −7 M. To sum up, the as-prepared SERS substrate is applicable for on-site detection and analysis of CV on various shell surfaces.
研究领域:
材料科学
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分析化学
·
纳米技术
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产品关联
DOI
高影响因子
ANALYTICA CHIMICA ACTA
·
2014
·
IF 4.517
Lei Ouyang,Lihua Zhu,Jizhou Jiang,Heqing Tang
Unsatisfactory sensitivity and stability for molecules with low polarizability is still a problem limiting the practical applications of surface-enhanced Raman scattering (SERS) technique. By preparing immobilized silver nanoparticles (Fe 3 O 4 /Ag) through depositing silver on the surface of magnetite particles, a highly sensitive and selective SERS method for the detection of trace glutathione (GSH) was proposed on the basis of a system of Fe 3 O 4 /Ag nanoparticles and crystal violet (CV), in which the target GSH competed with the CV probe for the adsorption on the Fe 3 O 4 /Ag nanoparticles. Raman insensitive GSH replaced the highly Raman sensitive CV adsorbed on the surface of Fe 3 O 4 /Ag particles. This replacement led to a strong decrease of the CV SERS signal, which was used to determine the concentration of GSH. Under optimal conditions, a linear response was established between the intensity decrease of the CV SERS signal and the GSH concentration in the range of 50–700 nmol L −1 with a detection limit of 40 nmol L −1 . The use of a Fe 3 O 4 /Ag substrate provided not only a great SERS enhancement but also a good stability, which guarantees the reproducibility of the proposed method. Its use for the determination of GSH in practical blood samples and cell extract yielded satisfactory results.
研究领域:
分析化学
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纳米技术
·
生物医学
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产品关联
DOI
PubMed
高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2017
·Vol. 409
·期 26
·6081-6090
·
IF 3.431
Sheng Zhen,Chen Ligang
Abstract The concentration of L-cysteine (Cys) and glutathione (GSH) is closely related to the critical risk of various diseases. In our study, a new rapid method for the determination of Cys and GSH in water and urine samples has been developed using a fluorescent probe technique, which was based on crystal violet (CV)-functionalized CdTe quantum dots (QDs). The original QDs emitted fluorescence light, which was turned off upon adding CV. This conjugation of CV and QDs could be attributed to electrostatic interaction between COO − of mercaptopropionic acid (MPA) on the surface of QDs and N + of CV in aqueous solution. In addition, Förster resonance energy transfer (FRET) also occurred between CdTe QDs and CV. After adding Cys or GSH to the solution, Cys or GSH exhibited a stronger binding preference toward Cd 2+ than Cd 2+ -MPA, which disturbed the interaction between MPA and QDs. Thus, most MPA was able to be separated from the surface of QDs because of the participation of Cys or GSH. Then, the fluorescence intensity of the CdTe QDs was enhanced. Good linear relationships were obtained in the range of 0.02–40 μg mL −1 and 0.02–50 μg mL −1 , and the detection limits were calculated as 10.5 ng mL −1 and 8.2 ng mL −1 , for Cys and GSH, respectively. In addition, the concentrations of biological thiols in water and urine samples were determined by the standard addition method using Cys as the standard; the quantitative recoveries were in the range of 97.3–105.8%, and relative standard deviations (RSDs) ranged from 2.5 to 3.7%. The method had several unique properties, such as simplicity, lower cost, high sensitivity, and environmental acceptability.
Crystal violet-functionalized CdTe quantum dots for detecting L-cysteine and glutathione with switch-on fluorescent strategy
研究领域:
分析化学
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生物医学
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产品关联
DOI
PubMed
高影响因子
Soft Matter
·
2018
·Vol. 14
·期 36
·7516-7525
·
IF 3.709
Ming Duan,Jiayi Wu,Yan Xiong,Shenwen Fang,Jie Chen
Different molecular structures lead to different adsorption performances. In this work, the adsorption behavior of two organic dyes, namely, crystal violet (CV, triphenylmethane dye of symmetric structure) and methylene blue (MB, azo dye of linear structure), were investigated, characterized and differentiated at the silica/water interface using the total internal reflection induced near field evanescent wave (TIR-NFEW) platform. According to the change in the evanescent wave intensity and following Beer's law, the adsorption behaviors of CV and MB can be monitored real time and sensitively. On one hand, the Langmuir adsorption model was applied to obtain the related thermodynamic data (including adsorption equilibrium constant (Kads) and adsorption free energy (ΔG)). With ΔG(MB) = −25.7 ± 1.7 kJ mol−1 < ΔG(CV) = −21.5 ± 0.6 kJ mol−1 < 0, the linear MB showed a higher spontaneous adsorption ability than the symmetric CV at the silica/water interface. On the other hand, a two-step adsorption kinetic model was applied to obtain the dynamics data including the linear adsorption rate constant (k1) and the exponential adsorption rate constant (k2). With k1(CV) < k1(MB) and k2(CV) ≈ k2(MB), MB diffused faster than CV at the first diffusion step but had nearly the same interaction speed as CV in the second adsorption step. A molecular-aligned-mechanism was successfully proposed to describe the interfacial interaction process for both CV and MB that includes molecular reactions involving electrostatic attraction of type I SiO− and H-bonds of type II SiOH. This work provides new insights into the molecular-level interpretation of the adsorption of the azo and triphenylmethane dyes at the silica–water interface.
研究领域:
物理化学
·
界面科学
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DOI
PubMed
高影响因子
MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Jiuhe Gao,Xiaohan Zhao,Yuhong He,Wenxiao Xu,Yongzhi Zhou,Xiao Feng,Guangyun He,Tian Zhong,Ye Peng,Ying Xiao,Xi Yu
Crystal violet (CV) and malachite green (MG) are antibiotics used in aquaculture, regulated due to their teratogenicity and potential carcinogenic risk. Detecting them in seafood is challenging due to low concentrations and complex matrices, especially fat interference. In this study, low-temperature clean-up removed fat interference, and magnetic nanoparticles preconcentrated the target analytes, achieving high sensitivity, low cost, and easy operation. The proposed method achieved detection limits of 0.18 ng g −1 and 0.54 ng g −1 for CV and MG, respectively, with quantification limits of 0.21 ng g −1 and 0.60 ng g −1 . The intra- and inter-day relative standard deviations were 1.45 %–4.81 % and 4.53 %–7.60 %, respectively, indicating good reproducibility. Recovery rates were 83.19 %–112.88 %, with stable adsorption capacity after 25 cycles. This method offers an ideal solution for rapid screening of CV and MG in seafood for batch samples in markets, stock houses, and on-site situations, adaptable to various analytes and matrices.
研究领域:
分析化学
·
食品安全
·
环境科学
·
纳米技术
·
水产养殖
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）